Which of the following is an observation? a. the baby was crying very loudly; therefore, he must have been hungry. b. jason stared at his computer screen for 2 minutes and then starting typing on the keyboard very rapidly. c. stella must have been very upset when she left the room and slammed the door behind her. d. john was jumping up and down because he was excited about his new puppy.

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force